I appreciate your efforts to try and resolve the issue you are experiencing and am sure it is uncomfortable at the least if not unnerving.

However, as you know, these forums and public message boards are not the best forums to address such individual and personal issues.

I know of nothing in animal foods that would resolve such an issue that is not available in plant foods (other than the B12 you have addressed). However, from a purely health perspective, I know of no harm that comes from a small amount of animal products in ones diet, though I am not recommending it.

I would recommend that you find a qualified health care professional you can work with closely in person who is sympathetic to a truly healthy lifestyle.